Rock-boring machine.



No. 703,390. Patented July 1902.

J. BBEJCHA & E. SCHULTE.

ROCK BORING MACHINE.

, (Application filed Jan 19, 1901.)

(No Model.)

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JOSEF BREJCHA, OF STRASBURG, AND EDUARD SCHULTE, OF DUSSELDORF, GERMANY.

HROCK-BYORING- MACHINE.

SPECIFICATION forming part of Letters Patent No. 703,890, dated July 1, 1902.

7 Application filed January 19, 1901. Serial No. 43,945. (No model.) i i To all whom it may concern:

Be it known that we, JosEF BREJCI-IA, a resident of Strasbnrg, and EDUARD ScHULTE, a resident of Dusseldorf, Germany, subjects of the Emperor of Germany, have invented an Improvement in Rock-Boring Machines, of which the following is a specification.

Our invention resides in the features and combinations of features hereinafter fully described, and particularly pointed out in the claims.

In the drawings, Figure 1 is a central vertical section of the invention. Fig. 2 is a side view of the same. Fig. 3 is a section of Fig. 1 on line A B. Fig. 4 is an end view looking from the left of Fig. l. 4

In the drawings, is is a cylinder arranged to rotate in bearings Z m, supported by brackets 17, 0 from a base p. This cylinder may be rotated in any suitable way, as by the gearing q, Fig. 1. Within this cylinder a piston f is arranged to slide,carrying a hollow piston-rod d, which projects out of the rear end of the cylinder.

Rotary motion is imparted to the hollow piston-rod by a coupling block or piece 10, Fig. 3, which is formed to fit flat surfaces w on the outer side of the hollow piston.

A hand-wheel 't' is fixed to the rear end of the rotary cylinder,by which it may be turned. WVithin the hollow piston-rod is a hollow boring-rod a, connected at its front end with the boring-tool b and at its rear end with the end of the hollow piston-rod dby means of a screwplug 0, which engages interior threads on the boring-rod and is fixed by a screw-thread to a cap g, which cap is connected to the pistonrod d by a pin h.

The bearing Z is provided with valves 1' and to, controlling the inlet and outlet of water to and from the pressure-space 8 within the rotary cylinder and surrounding the hollow piston-rod,the pressure in which space acts upon the piston-head f.

A space is left at 6 between the hollow piston-rod d and the boring-rod, and a port If leads from the space 3 to this space e, while another port a: leads from the said space e to the interior of the hollow boring-rod, and thus the water is free topass to the working parts,keeping them cool, and disintegrate the material bored.

When the piston f has moved all the way forward,the hollow piston-rod and the boringrod may be uncoupled at their rear ends, and then by connecting a new length of rod with the rear end of the length which has been advanced and still holds the boring-tool the operation of boring may be continued, it being understood that the piston f is now retracted, so that the rear end of thepiston-rod can be connected with the rear end of the new length of the boring-rod, it being understood also that this new length, besides having a screwthreaded front end to fit into the rear end of the original length of boring-rod, has also an interior screw-thread at its rear end to receive the screw-plug c.

We claim 1. In combination in a boring-machine, a boring-rod a,a cylinder 70,2, piston-headf with- -in the said cylinder, a piston-rod (1 connected to the pistonand within which the boring-rod is located and a connection between the hollow'piston-rod and the boring-rod, said con-. nection being detachable and outsidethe rear end of the cylinder,substantiallyas described.

2. In combination in a boring-machine, a boring-rod, a cylinder 7c,a piston-head f with in the said cylinder, a'piston-rod 61 connected to the piston and within which the boring-rod is located, and a connection'between-the hollow piston-rod and, the boring-rod, said connection comprising the head g, the pin hand 'the screw-plug c, substantially as described.

3. In combination, the rotary cylinder, the piston and hollow piston-rod therein, the boring-rod within the hollow piston-rod, a coupling-nut to between the rotary cylinder and the hollow piston-rod to turn thelatter and a connection between the hollow piston-rod and the boring-rod, said connection comprising the screw-plug c, engaging the inner rear end of the boring-rod, substantially as described.

In witness whereof we have hereunto set our hands in presence of two witnesses.

J OSEF BREJOHA. EDUARD SOHULTE.

Witnesses. as to signature of Josef Brejeha:

SIEGFRIED STHUSER, MAX ADLER.

WVitnesses as to signature of WM. ESSENWEIN,

P. LIEBER.

Ed. Schnlte: 

